Improvement in fire-place air-heaters



I L. JOHNSTON. Fire-Place Air-Heater.

No.207,52 5. Patented Aug. 27.18 78 WITNESSES Q NVENTOR 0 m v ATTORN EYUNITED STATES PATENT OFFICE.

LYSANDER JOHNSTON, OF DANVILLE, ILLINOIS.

IMPROVEMENT IN FIRE-PLACE AIR-HEATERS.

Specification forming part of Letters Patent No. 207,526, dated August27, 1878 application filed March 2, 1878.

To all whom it may concern:

Be it known that I, LYSANDER JOHNSTON, of Danville, in the county ofVermillion and State of Illinois, have invented a new and valuableImprovement in Fire-Place Air-Heaters; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawings is a representation of a longitudinal sectionof my fire-place air-heater. Fig. 2 is a vertical transverse sectionthereof.

This invention has relation to improvements in fire-place air-heaters.

The object of the invention is to utilize the backs and sides offire-places to heat air, which being warmed is delivered by conduits tothe desired point.

The nature of the invention consists in the combination, with the threevertical chimney or draft flues, of two parallel horizontal flues,connecting the two side flues above and below horizontal partitions inthe side flues, and an gular vertical flues connecting said parallelhorizontal flues and forming a fire-back, as hereinafter shown anddescribed.

In the accompanying drawings, the letter A designates a wall of a house,having a flue, B, for the passage of smoke, and two lateral flues, O andD, for a purpose hereinafter set forth. The flues O and D are divided bya transverse partition, a, into an upper and lower branch, lettered,respectively, 0 o and d d. The lower branch, d, of the flue D has anaperture in its rear wall leading to the exterior air, and the upperbranch an opening in its front wall, closed at pleasure by a suitableregister. E represents a cast-metal box, of the general form of arectangle, thatis built into the wall across the smoke-flue B, and opensat each end into the flues O D, thereby establishing a communicationbetween them above the partitions a, and F is a similar box connectingthe said flues below the said partitions a. The opposite horizontalfaces of these boxes are slotted, as shown at t and i, and in theseslots are seated the ends of the independent angular metallic tubes G,arranged side by side, and constituting the fire-place back. These tubesare rectangular in cross section, preferably, and present a smooth outersurface. The cheeks H of the fire-place are made of fire-brick, and setin snugly against the end tubes of the back and the lower box-tube F.The grate is hung in the arch of the fire-place in the usual manner, andthe products of combustion pass into the flue B through a reducedthroat, t, formed by a depression, I, on the upper face of the boxtubeand a backward and upward flare, l, of the arch of the fire-place.

By removing the metallic arch plate N, the cheeks of the fireplace maybe removed and the lower horizontal tube, F, exposed. It may be thenremoved, and such of the sections of the back as may have been burnedout readily removed.

Cold air is admitted into the flueD through the opening a. It thenpasses into the lower horizontal flue-pipe, F, through an opening, a, inthe side wall of the vertical flue D, and passes upward through thepipes G of the back into the upper horizontal flue, E. It passes in ahighly-heated state out of the ends of this flue into the lateral fluesO D, which deliver it at the apartment to be warmed.

The flue 0 extends upward beyond the ceiling, and opens usually into theroom or rooms above, the airsupply being regulated by a suitableregister.

What I claim as new, and desire to secure by Letters Patent, is

The combination, with the vertical flues G B D, of the parallelhorizontal flues E F, extending across the flue B, and connecting theflues O D above and below the partitions a, and the angular flues G,connecting the flues E and F, and forming the fire-back, substantiallyas specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

LYSANDER JOHNSTON.

'Witnesses:

J OHN P. NORVELL, SEP. H. STEWART.

